Bending machine



May 20, 1930. w, Wm v 1,759,053

v BENDING MACHINE Filed Nov 18, 1927 4 Sheets-Sheet 1 I IN VEN TOR. MUM/7 6 dew 7 ATTORNEY May 20, 1930- w, c. IRVIN 1,759,053

BENDING MACHINE Filed Nov, 18, 1927 4 Sheets-Sheet 2 V II ATTORNEY- May 20, 1930.

w. c. IRVIN 1,759,053

Sheets-Sheet 3 Filed Nov. 18, 1927 INVENTOR. Maw/7 C/,/ //X ATTORNEY Patented May 20, 1930 UNITED STATES PATENT QFFICE WILLIAM C. IRVIN, OF OAKLAND, CALIFORNIA, ASSIGNOR TO Y AGER SHEET META] COMPANY, A COPAR'INERSHIP COMPOSED 0F ISA-BELLE YAGER, RALPH G. YAGEB, AND GEORGE L. YAGEB, OF OAKLAND, CALIFORNIA BENDING MACHINE Application filed November 18, 1927. Serial No. 234,209.

The invention forming the subject matter of this application relates to bending machines. a i

The bending machine hereinafter described 5 is used particularly in connection. with the manufacture of louvre ventilators. The louvre ventilatorhas a casing which is secured in the wall and forms a passage therethru. Said casing has flanges thereon ing the casing to the wall. The casing and the louvre cover are made separately and secured together after the same are formed in the proper shape and cut to the proper size, the cover extending beyond the flange of the casing. On account of the use of a plurality of flanges above each other great hardships are encountered in the efflcient manufacture and assembly 'of the different parts of the ventilator, especially when the securing edges of the cover must be re-bent over the protruding portions of the casing. The re-bending of the over-lapping edges of the cover is partly hindered by the channels formed by the flanges on the sides of the casing.

The principal object of the invention is the provision of a bending machine that is adapted for bending and securing the edges of a cover over the flanges of a casing without in any way interfering with the secondary flanges or other members that maybe disposed in a spaced relation to and above the edges of said casing.

Another object of the invention is to provide a bending machine for securing the edges of a cover over the flanges of the easing, said machine having bending tools thereon rotatably supported in the full length thereof in such a manner as to simultaneously re-bend all the securing edges of the cpver and to hold the cover and the casing on the work table. 7

A further object of the invention is the provision of a bending machine for bending the edges of a cover over the edges of a casing and the provision of a common drive mechanism thereon that permits the simultaneous conveying of power to all the bending adapted to cooperate with the wall in secur tools, said tools being disposed adjacent to the sides of said cover and casing.

A still further object of the invention is the provision of a bending machine, the bending tools of which are always concentric to the stationary bearings adapted to hold and to guide said tools.

l/Vith the above mentioned objects and other objects in view, the invention consists in the novel construction and combination of parts hereinafter described and illustrated in the accompanying drawings and set forth in the claims'hereto appended, it being understood that various changes in the form, proportion size and minor details of construction within the scope of the claims may be resorted to Without departing from the spirit or without sacrificing any of the ad vantages of the invention.

In the accompanying drawing, Figure 1 is a front elevation of the bending machine, the front portion of the frame member and the working table shown partly in section. Figure 2 is a sectional view taken on the line 22 of Figure 1. Figure 3 is a plan view of the bending machine. Figure 4 is a cross? sectional View taken along the line 4.'4 of Figure 1. Figure 5 is a sectional detail view of the working table and the bending tools showing the same in relative position to a louvre ventilator before the bending of the edges of the cover and Figure 6 is a sectional view showing the relative position of the bending tools to the work table and the work aft-er the edges of the cover are bent over the flanges of the casing.

In carrying out my invention, I make use of a frame designated in its entirety by the numeral 1. Legs 2 rest upon a base and form the support of the frame. A driveshaft 3 is supported in bearings 4, which are in turn secured to the legs 2. A driving gear 5 of a comparatively small diameter, is'carried on the shaft 3 and is rotated thereby. A reduction gear 6 is constantly in mesh with the driving gear 5. VA driven shaft 7 is rotatably supported in bearings 8, said bearings being supported on cross-bars 9, said cross-bars extend between the adjacent legs 2 of the frame and are secured thereto. The

reduction gear 6 is keyed to the driven shaft 7 so as to transmit power thereto. An eccentric cam 11 is keyed to the shaft 7, said cam being rotatable in an eccentric strap 12. A rod 13 is screwed into said eccentric strap and is held against accidental turning by a lock nut 14.

A work-holding member denoted in its entirety by the numeral 15 is secured to the upper extremity of said frame 1. A guide rod 16 secured to said member, in a manner to be hereinafter described, extends downwardly therefrom. A slot 17 is cut in one side of said guide rod. A sleeve 18 is pivotally secured to the rod 13 and is slidable on said guide rod 16. A pivot pin 19 connects said rod to said sleeve and is parallel with the shaft 7. A key 20 is secured to said sleeve by means of a set screw 21 and slidably engages the slot 17 thereby preventing the turning of the rod 13 relatively to the guide rod 16, unless the pin 19 is removed. The rotation of the shaft 7 and the cam 11 thereon causes the displacement of the strap 12, thereby causing the rod 13 to reciprocate on said guide rod 16. The lateral displacement of the strap 12 also turns the rod 13 on the pin 19.

The work-carrying member 15 comprises a table 22 and the bending tools. A tool bearing 23 is disposed adjacent to each side of the table 22. The upper extremity of each leg 2 is flanged as at 24 and the tool bearings 23 are supported on said flanged portions and are secured thereto by means of screws The table 22 is secured to the tool bearings 23 by means of other set screws 26, the head of said latter set screws being sunk in the lower face of said tool bearings so as to present an even surface for resting upon the flange portion 24. The guide rod 16 has a head 27 thereon, said head being disposed in the center of the lower face of the table 22 and is secured thereto.

A bending tool 28 is rotatable in each tool bearing 23, said tool bearing being lined with babbitt in order to reduce friction. The bottom edges of the table 22 are bevelled as at 29, said bevelled edges extending into the corresponding recess of the tool bearing 23.

Each bending tool is cylindrical, one side thereof being cut away so that it presents a die face 31 parallel with the edge of the table 22 and substantially at right angles to the plane thereof. Said die face is slightly spaced from the edge of the table so that the work is first engaged by the outside edge thereof. WVhen the die face is turned so that it assumes a position parallel with the level of the table it will provide sufficient clearance for the flanges of the work therebetween. The cut away portion of the bending tools is terminated on the other side thereof by a clearance face 32, substantially parallel with the bevelled edge 29 when the die face is disposed at right angles to the plane of the table 22. The ends 30 of the bending tool 28 are cut off to about a 45 degree bevel, in order to obviate any danger of interference between the tools.

An opening 33 is provided at an intermediate point on each tool bearing 23. An arm 34 extends from the bending tool 28, it is movable in the opening 33 and is held thereby against lateral movement. A link designated in its entirety by the numeral 35 is pivotally secured to a forked end of said arm by means of a pivot pin 36, said pin being maintained in position by a set screw 37, threaded into said link. The pivot pin 36 is rotatable in the forked end of the arm 34.

The other end of each link 35 is pivoted in a similar manner in lug 38 extending from the sleeve 18. The link 35 is so constructed as to render the length thereof readily adjustable, namely, a link rod 39 is screwed into a link lug 41 and is held in an adjusted posi tion by a lock nut 42.

The invention operates as follows: The work, in the present case, a louvre ventilator 43, comprises a casing 44 having flanges 45 at one end thereof; a louvre cover 46 extends over said flanges, the edges of said cover being bent upwardly approximately at right angles as at 47.

The cover is placed on the table 22, then a screen 48 is disposed on the cover, said screen extending to the bent edges 47. The casing 44 is now placed on the top of the screen 48, so that the flanges 45 thereof are adjacent to the bending line of the edges 47. A channel 49 is then inserted over the flanges 45 on at least two sides of the casing 44.

Then the power is applied to the driving shaft 3 and is transmitted to the driven shaft 7 by means of the reduction gears 5 and 6. The shaft 7 rotates the eccentric cam 11 which, in turn, causes the displacement of the strap 12 and the rod 13 around the pivots 19, at the same time reciprocating the sleeve 18 on the guide rod 16. The upward movement of the sleeve 18 causes the links 35 to turn the arms 34 outwardly in the slots 33, thereby rotating the bending tools 28 in the tool bearings 23. The bending tools are thereby brought 1 from the position shown in Figure 5 into the position shown in Figure 6.

The upper edge of each die face 31 engages a bent edge 47 and gradually bonds the same over the casing flange 45 and over the lower portion of the channel 49 disposed on said flanges until the whole die face bears upon the bent portion 47 thereby securing the cover and the channel to the casing. The clearance of the die face 31 from the edge of the table 22 permits the die face to assume a position substantially parallel with the plan of the table and to exert an even pressure over the whole bent edge 47.

In the event of uneven pressureexerted upon the different bending tools 28 the length of any of the links 35 may be adjusted to de-' termine the turning moment on said tools in accordance with the travel of the rod 13 and in alignment with each other, so that the pressure will be equal on all bent edges of the cover. The temporary removal of the pin 36 is necessary in order to permit the turning of the link rod 39. The change of the turning moment of all the tools by adjusting the length of all the links 35 may necessitate the adjustment of the length of the rod 13, which latter is readily effected by the turning of the rod after the lock nut 14 is unscrewed and the pin 19 is temporarily removed. Of course, this turn-ing must be a 180 degrees or 360 de grees movement so that the pin 19 remains in alignment with the shaft 7.

It will be recognized that a particularly compact machine is provided to accomplish the bending of the edges of a louvre cover over the flanges of a casing without in any way interfering with the upper flanges of the channel 49. It will be also noted that a r movement of the bending tools may be readily adjusted and is always completely under the control of the operator. The bending tools also clamp the work to the work table, thereby obviating the necessity of any separate clamping means. The bending machine is so designed that the actual assembly of the louvre ventilator is performed on the table thereof, and then by the actuating of the bending mechanism, the different parts assembled on the table are secured to each other in one operation. After the return of the bending tools to an inoperative position, the assembled louvre ventilator is readily removable from the table. Being a unitary character, the machine requires no careful setting up and lends itself to effective application by the labor ordinarily available.

Having thus described my invention, what I now claim is novel and desire to secure by Letters Patent is 1. In a bending machine for rebending the upwardly extending flanges of a work, a table for supporting said work, bending tools, bearings secured to the table for rotatably holding said tools, the axes of rotation of said tools being outside of said flanges; each tool having a die face thereon disposed at an angle to the plane of the table; arms on said tools slidably extending thru said bearings, and means for simultaneously swinging said arms thereby causing said die faces to rebend said flanges and to clamp the work over said table.

2. In a bending machine for bending the upwardly extending flanges of a work, a table for supporting the Work, bending tools rotatably secured to the table, the axes of rotation of said tools being outside of and adjacent to said flanges; each tool having a die face thereon disposed at an angle to the plane of the table; reciprocating means for rotating said bending tools so as to simultaneously turn said die faces over the top of the table thereby to bend said flanges, and means slidably extending thru said bearings for operatively connecting said reciprocating means to said tools. 7

3. In a bending machine for rebending the upwardly extending flanges of a work, a table for supporting said work, bending tools, bearings secured to the table for rotatably holding said tools, the axes of rotation of said tools being outside of'said flanges; each tool having a die face thereon disposed at an angle to the plane of the table; arms on said tools slidably extending thru said bearings, reciprocating means for simultaneously swinging said arms thereby causing said die faces to rebend said flanges and to clamp the work over said table.

4. In a bending machine for rebending the upwardly extending flanges of a work, a table for supporting said work, bending tools, bearings secured to the table for rotatably holding said tools, the axes of rotation of said tools being outside of said flanges; each tool having a die face thereon disposed at an angle to the plane of the table; arms on said tools slidably extending thru said bearings, adjustable means for simultaneously swinging said arms thereby causing said die faces to rebend said flanges and to clamp the work over said table.

5. In a bending machine for rebending the swinging said arms'thereby causing said die faces to rebend said flanges and to clamp the work over said table, and reciprocating means to move said links.

6. In a bending machine for rebending the upwardly extending flanges of a work, a table for supporting said work, bending tools, bearings secured to the table for rotatably holding said tools, the axes of rotation of said tools being outside of said flanges; each tool having a die face thereon disposed at an angle to the plane of the table; arms on said tools slidably extending thru said bearings; links for swinging said arms thereby causing said die faces to rebend said flanges and to clamp the work over said table; reciproeating means to move said links and eccentric means for transmitting power to said reciprocating means.

7 In a bending machine for rebending the upwardly extending flanges of a work, a table for supporting said work, bending tools, bearings secured to the table for rotatably holding said tools, the axes of rotation of said tools being outside of said flanges; each tool having a die face thereon disposed at an angle to the plane of the table; arms on said tools slidably extending thru said bearings; links for swinging said arms thereby causing said die faces to rebend said flanges and to clamp the work over said table; reciprocating means to move said links, eccentric means for transmitting power to said reciprocating means, and guiding means depending from said table for guiding said reciprocating means.

8. In a bending machine for rebending the upwardly extending flanges of a work, a table for supporting said work bending tools, bearings secured to the table for rotatably holding said tools, the axes of rotation of said tools being outside of said flanges; each tool having a die face thereon disposed at an angle to the plane of the table; arms on said tools slidably extending thru said bearings; links for swinging said arms thereby causing said die faces to rebend said flanges and to clamp the work over said table, and adjustable means to move said links.

In testimony whereof I aiiix my signature.

WILLIAM C. IRVIN. 

